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Script to Find All IP Addresses on a Internal Network

I was working on a presentation this morning and as I was writing I realized I did not have a quick fast way to make a list of all the internal Ips on a LAN (Local Area network). Many of the tools I use including nmap, nessus and nexpose will accept a list of ips so I decided to whip up a quick dirty shell script to get the job done. I may clean it up in the future but for now it does its job. This is meant to work on Backtrack 4 but in its current state it will work on any Debian based distro. As always with any code found on the internet you use this at your own risk. Also I am sure this can be done better but like I said it was a 10 minute fix.